This document discusses how risk can be used in advertising. It describes an experiment where students were asked if they would prefer $500 for sure or a 15% chance to win $1 million. About half chose the sure $500 despite the potential higher expected value of $150,000 from the risky option. The document notes that customers generally prefer product satisfaction guarantees to reduce risk. It advises advertisers to use such guarantees to appeal to customers' preference for reducing risk when making purchases.